I18n Functions

Load translations from external JSON files at application startup. This is typically done in app.sl to make translations available globally.

JSON File Format

{
    "app": {
        "title": "My Application",
        "welcome": "Welcome!"
    },
    "nav": {
        "home": "Home",
        "about": "About"
    },
    "common": {
        "save": "Save",
        "cancel": "Cancel"
    }
}

Helper Functions

Create a helper to load translations from JSON files. This flattens nested JSON into dot-notation keys.

let i18n_translations = {};

def flatten_dict(dict, prefix) -> Hash
    let result = {};
    for (pair in entries(dict)) {
        let key = pair[0];
        let value = pair[1];
        let full_key = prefix + "." + key;
        if (type(value) == "Hash") {
            let nested = flatten_dict(value, full_key);
            for (np in entries(nested)) {
                result[np[0]] = np[1];
            }
        } else {
            result[full_key] = value;
        }
    }
    return result;
end

def i18n_load_translations(locale, dict)
    let flat = flatten_dict(dict, locale);
    for (pair in entries(flat)) {
        i18n_translations[pair[0]] = pair[1];
    }
end

Loading in app.sl

Load all translation files at application startup. They'll be available globally.

# Load translation files from locales/ directory
let en_data = json_parse(slurp("locales/en.json"));
let fr_data = json_parse(slurp("locales/fr.json"));
let de_data = json_parse(slurp("locales/de.json"));

i18n_load_translations("en", en_data);
i18n_load_translations("fr", fr_data);
i18n_load_translations("de", de_data);

# Set default locale
I18n.set_locale("en");

# Define routes
http_server_get("/", "home#index");
http_server_listen(3000);